Software Migration Cost Calculator

Switching software looks like a subscription comparison and is actually a labour project. The subscription difference is the small part. The costs that decide whether a migration pays for itself are staff hours, the overlap period when both systems are live, and the productivity dip while people learn the new one.

Put in your own numbers below to see how many months of savings it takes to get back to even.

The hours estimate is where this goes wrong

Ask anyone who has done a migration: the hours figure people start with is roughly half the real one. Data that has accumulated for years is never as clean as it looks in a demo, and every report, automation, and integration built on the old system has to be rebuilt and verified.

Double your first estimate and see whether the payback still holds. If it does, the decision is robust. If it flips, you have learned the important thing before spending anything.

Costs that never appear on a quote

• Historical data. Exporting is easy; importing with relationships intact is not. Decide early how many years actually need to move.
• Anything built on the API. Custom scripts and connectors are rewrites, not migrations.
• The second system you forgot. Reporting tools, e-signature, payroll connectors — anything that talks to the old system has to be pointed at the new one.